/**
 * @file XListView.java
 * @package me.maxwin.view
 * @create Mar 18, 2012 6:28:41 PM
 * @author Maxwin
 * @description An ListView support (a) Pull down to refresh, (b) Pull up to load more.
 * Implement IXListViewListener, and see stopRefresh() / stopLoadMore().
 */
package striveen.util.used.view.view;

import android.content.Context;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.widget.*;
import android.widget.AbsListView.OnScrollListener;
import com.example.aymutilused2.R;


public class HeadFloatXListView extends ListView implements OnScrollListener {
	private GestureDetector mGestureDetector;

	private float mLastY = -1; // save event y
	private Scroller mScroller; // used for scroll back
	private OnScrollListener mScrollListener; // user's scroll listener

	// the interface to trigger refresh and load more.
	private IXListViewListener mListViewListener;

	// -- header view
	private XListViewHeader mHeaderView;
	// header view content, use it to calculate the Header's height. And hide it
	// when disable pull refresh.
	private RelativeLayout mHeaderViewContent;
	private TextView mHeaderTimeView;
	private int mHeaderViewHeight; // header view's height
	private boolean mEnablePullRefresh = true;
	private boolean mPullRefreshing = false; // is refreashing.

	// -- footer view
	private XListViewFooter mFooterView;
	private boolean mEnablePullLoad;
	private boolean mPullLoading;
	private boolean mIsFooterReady = false;

	// total list items, used to detect is at the bottom of listview.
	private int mTotalItemCount;

	// for mScroller, scroll back from header or footer.
	private int mScrollBack;
	private final static int SCROLLBACK_HEADER = 0;
	private final static int SCROLLBACK_FOOTER = 1;

	private final static int SCROLL_DURATION = 400; // scroll back duration
	private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px
	// at bottom, trigger
	// load more.
	private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
	// feature.

	private int currentPage = 0;
	private int totalPage = 2147483647;
	private int pageSize = 10;


	/**
	 * @param context
	 */
	public HeadFloatXListView(Context context) {
		super(context);
		initWithContext(context);
	}

	public HeadFloatXListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initWithContext(context);
	}

	public HeadFloatXListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initWithContext(context);
	}

	private void initWithContext(Context context) {
		mScroller = new Scroller(context, new DecelerateInterpolator());
		mGestureDetector = new GestureDetector(new YScrollDetector());
		// XListView need the scroll event, and it will dispatch the event to
		// user's listener (as a proxy).
		super.setOnScrollListener(this);

		// init header view
		mHeaderView = new XListViewHeader(context);
		mHeaderViewContent = (RelativeLayout) mHeaderView
				.findViewById(R.id.xlistview_header_content);
		mHeaderTimeView = (TextView) mHeaderView
				.findViewById(R.id.xlistview_header_time);
		addHeaderView(mHeaderView);

		// init footer view
		mFooterView = new XListViewFooter(context);

		// init header height
		mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
				new OnGlobalLayoutListener() {
					@Override
					public void onGlobalLayout() {
						mHeaderViewHeight = mHeaderViewContent.getHeight();
						getViewTreeObserver()
								.removeGlobalOnLayoutListener(this);
					}
				});
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
		super.onInterceptTouchEvent(ev);
		return mGestureDetector.onTouchEvent(ev);
	}

	// Return false if we're scrolling in the x direction
	class YScrollDetector extends GestureDetector.SimpleOnGestureListener {
		@Override
		public boolean onScroll(MotionEvent e1, MotionEvent e2,
		                        float distanceX, float distanceY) {
			if (Math.abs(distanceY) - Math.abs(distanceX) > 0.06) {
				return true;
			}
			return false;
		}
	}

	@Override
	public void setAdapter(ListAdapter adapter) {
		// make sure XListViewFooter is the last footer view, and only add once.
		if (mIsFooterReady == false) {
			mIsFooterReady = true;
			addFooterView(mFooterView);
		}
		super.setAdapter(adapter);
	}

	/**
	 * enable or disable pull down refresh feature.
	 *
	 * @param enable
	 */
	public void setPullRefreshEnable(boolean enable) {
		mEnablePullRefresh = enable;
		if (!mEnablePullRefresh) { // disable, hide the content
			mHeaderViewContent.setVisibility(View.INVISIBLE);
		} else {
			mHeaderViewContent.setVisibility(View.VISIBLE);
		}
	}

	/**
	 * enable or disable pull up load more feature.
	 */
	public void setPullLoadEnable(boolean enable) {
		mEnablePullLoad = enable;
		if (!mEnablePullLoad) {
			mFooterView.hide();
			mFooterView.setOnClickListener(null);
		} else {
			mPullLoading = false;
			mFooterView.show();
			mFooterView.setState(XListViewFooter.STATE_NORMAL);
			// both "pull up" and "click" will invoke load more.
			mFooterView.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					startLoadMore();
				}
			});
		}
	}

	/**
	 * stop refresh, reset header view.
	 */
	public void stopRefresh() {
		if (mPullRefreshing == true) {
			mPullRefreshing = false;
			resetHeaderHeight();
		}
	}

	/**
	 * stop load more, reset footer view.
	 */
	public void stopLoadMore() {
		if (mPullLoading == true) {
			mPullLoading = false;
			mFooterView.setState(XListViewFooter.STATE_NORMAL);
		}
	}

	/**
	 * 停止加载  add by Jaelyn
	 * @return
	 */
	public void loadComplete(){
		stopRefresh();
		stopLoadMore();
	}

	public int getCurrentPage() {
		correctCurrentPage();
		return this.currentPage;
	}

	public int getNextPage() {
		return getCurrentPage() + 1;
	}

	public int getPageSize() {
		return this.pageSize;
	}

	public void setPageSize(int pageSize) {
		//long totalSize = (long) (this.pageSize * this.totalPage);
		if (pageSize < 1) {
			this.pageSize = 10;
		} else {
			this.pageSize = pageSize;
		}

		//this.setTotalSize(totalSize);
	}

	public boolean isNoMoreData() {
		return this.getAdapter().getCount() % 10 != 0;
	}

	private void correctCurrentPage() {
		if (this.getAdapter() != null) {

			int count = this.getAdapter().getCount();
			if (count % this.pageSize == 0) {
				this.currentPage = count / this.pageSize;
			} else {
				this.currentPage = count / this.pageSize + 1;
			}

		} else {
			this.currentPage = 0;
		}

	}


	/**
	 * set last refresh time
	 *
	 * @param time
	 */
	public void setRefreshTime(String time) {
		mHeaderTimeView.setText(time);
	}

	private boolean isNoMore;


	/**
	 * 设置底部提示   Jaelyn
	 * @param msg
	 */
	public void setFootMsg(String msg){
		if(TextUtils.isEmpty(msg)){
			msg="  ";
		}
		mFooterView.setText(msg);
	}

	/**
	 * 设置提示 并开启刷新点击事件    Jaelyn
	 * @param msg
	 * @param noMore
	 */
	public void setFootMsg(String msg, boolean noMore) {
		isNoMore = noMore;
		if(TextUtils.isEmpty(msg)){
			msg="  ";
		}
		mFooterView.setText(msg);
		if (isNoMore) {
			return;
		}

		mFooterView.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				startLoadMore();
			}
		});
	}

	public void setFooterText(boolean noMore) {
		setFooterText(null, noMore);
	}

	public void setFooterText() {
		setFooterText(null, true);
	}

	public void setFooterText(String txt) {
		setFooterText(txt, true);
	}

	public void setFooterText(String txt, boolean noMore) {
		isNoMore = noMore;
		if (!isNoMore) {
			return;
		}
		mFooterView.setText(txt);
		mFooterView.setState(XListViewFooter.STATE_NOMORE);
		mFooterView.setOnClickListener(null);
	}

	private void invokeOnScrolling() {
		if (mScrollListener instanceof OnXScrollListener) {
			OnXScrollListener l = (OnXScrollListener) mScrollListener;
			l.onXScrolling(this);
		}
	}

	private void updateHeaderHeight(float delta) {
		mHeaderView.setVisiableHeight((int) delta
				+ mHeaderView.getVisiableHeight());
		if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头
			if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
				mHeaderView.setState(XListViewHeader.STATE_READY);
			} else {
				mHeaderView.setState(XListViewHeader.STATE_NORMAL);
			}
		}
		setSelection(0); // scroll to top each time
	}

	/**
	 * reset header view's height.
	 */
	private void resetHeaderHeight() {
		int height = mHeaderView.getVisiableHeight();
		if (height == 0) // not visible.
			return;
		// refreshing and header isn't shown fully. do nothing.
		if (mPullRefreshing && height <= mHeaderViewHeight) {
			return;
		}
		int finalHeight = 0; // default: scroll back to dismiss header.
		// is refreshing, just scroll back to show all the header.
		if (mPullRefreshing && height > mHeaderViewHeight) {
			finalHeight = mHeaderViewHeight;
		}
		mScrollBack = SCROLLBACK_HEADER;
		mScroller.startScroll(0, height, 0, finalHeight - height,
				SCROLL_DURATION);
		// trigger computeScroll
		invalidate();
	}

	private void updateFooterHeight(float delta) {
		int height = mFooterView.getBottomMargin() + (int) delta;
		if (mEnablePullLoad && !mPullLoading) {
			if (isNoMore) {
				mFooterView.setState(XListViewFooter.STATE_NOMORE);
			} else {
				if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke
					// load
					// more.
					mFooterView.setState(XListViewFooter.STATE_READY);
				} else {
					mFooterView.setState(XListViewFooter.STATE_NORMAL);
				}
			}
		}
		mFooterView.setBottomMargin(height);

		// setSelection(mTotalItemCount - 1); // scroll to bottom
	}

	private void resetFooterHeight() {
		int bottomMargin = mFooterView.getBottomMargin();
		if (bottomMargin > 0) {
			mScrollBack = SCROLLBACK_FOOTER;
			mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,
					SCROLL_DURATION);
			invalidate();
		}
	}

	private void startLoadMore() {
		mPullLoading = true;
		mFooterView.setState(XListViewFooter.STATE_LOADING);
		if (mListViewListener != null) {
			mListViewListener.onLoadMore();
		}
	}

	private void noLoadMore() {
		mPullLoading = false;
		mFooterView.setState(XListViewFooter.STATE_NOMORE);
		if (mListViewListener != null) {
			mListViewListener.onLoadMore();
		}
	}


	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		if (mLastY == -1) {
			mLastY = ev.getRawY();
		}

		// head float
		float y = ev.getY();
		int action = ev.getAction() & MotionEvent.ACTION_MASK;
		switch (action) {
			case MotionEvent.ACTION_DOWN:
				StartY = y;
				break;
			case MotionEvent.ACTION_MOVE:
				if (!isRuning) {
					if ((y - StartY) < 0) {
						//hideHeadBar();
					}

					if ((y - StartY) > 0) {
						//showHeadBar();
					}
				}
				break;
			case MotionEvent.ACTION_UP:
				StartY = 0;
				break;
		}

		switch (ev.getAction()) {
			case MotionEvent.ACTION_DOWN:
				mLastY = ev.getRawY();

				break;
			case MotionEvent.ACTION_MOVE:
				final float deltaY = ev.getRawY() - mLastY;
				mLastY = ev.getRawY();
				if (getFirstVisiblePosition() == 0
						&& (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
					// the first item is showing, header has shown or pull down.
					updateHeaderHeight(deltaY / OFFSET_RADIO);
					invokeOnScrolling();
				} else if (getLastVisiblePosition() == mTotalItemCount - 1
						&& (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
					// last item, already pulled up or want to pull up.
					updateFooterHeight(-deltaY / OFFSET_RADIO);
				}

				break;

			default:
				mLastY = -1; // reset
				if (getFirstVisiblePosition() == 0) {
					// invoke refresh
					if (mEnablePullRefresh
							&& mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
						mPullRefreshing = true;
						mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
						if (mListViewListener != null) {
							mListViewListener.onRefresh();
						}
					}
					resetHeaderHeight();
				} else if (getLastVisiblePosition() == mTotalItemCount - 1) {
					// invoke load more.
					if (mEnablePullLoad
							&& mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA
							&& !mPullLoading) {
						if (isNoMore) {
							noLoadMore();
						} else {
							startLoadMore();
						}

					}
					resetFooterHeight();
				}
				break;
		}
		return super.onTouchEvent(ev);
	}

	@Override
	public void computeScroll() {
		if (mScroller.computeScrollOffset()) {
			if (mScrollBack == SCROLLBACK_HEADER) {
				mHeaderView.setVisiableHeight(mScroller.getCurrY());
			} else {
				mFooterView.setBottomMargin(mScroller.getCurrY());
			}
			postInvalidate();
			invokeOnScrolling();
		}
		super.computeScroll();
	}

	@Override
	public void setOnScrollListener(OnScrollListener l) {
		mScrollListener = l;
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		if (mScrollListener != null) {
			mScrollListener.onScrollStateChanged(view, scrollState);
		}
	}

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
	                     int visibleItemCount, int totalItemCount) {
		// send to user's listener
		mTotalItemCount = totalItemCount;
		if (mScrollListener != null) {
			mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
					totalItemCount);
		}
	}

	public void setXListViewListener(IXListViewListener l) {
		mListViewListener = l;
	}

	/**
	 * you can listen ListView.OnScrollListener or this one. it will invoke
	 * onXScrolling when header/footer scroll back.
	 */
	public interface OnXScrollListener extends OnScrollListener {
		public void onXScrolling(View view);
	}

	/**
	 * implements this interface to get refresh/load more event.
	 */
	public interface IXListViewListener {
		public void onRefresh();

		public void onLoadMore();
	}


	//head float start
	float StartY = 0;
	Boolean isRuning = false;
	public View mHeadBar;
	private Animation translateAnimation = null;
	public void showHeadBar() {
		if (mHeadBar != null && mHeadBar.getVisibility() == View.GONE) {
			translateAnimation = AnimationUtils.loadAnimation(this.getContext(), R.anim.in_anim);
			mHeadBar.startAnimation(translateAnimation);
			translateAnimation.setAnimationListener(new Animation.AnimationListener() {
				@Override
				public void onAnimationStart(Animation animation) {
					mHeadBar.setVisibility(View.VISIBLE);
					isRuning = true;
				}

				@Override
				public void onAnimationRepeat(Animation animation) {
				}

				@Override
				public void onAnimationEnd(Animation animation) {
					isRuning = false;
				}
			});
		}
	}


	private void hideHeadBar() {

		if (mHeadBar != null  && mHeadBar.getVisibility() == View.VISIBLE) {
			translateAnimation = AnimationUtils.loadAnimation(this.getContext(), R.anim.out);
			mHeadBar.startAnimation(translateAnimation);
			translateAnimation.setAnimationListener(new Animation.AnimationListener() {
				@Override
				public void onAnimationStart(Animation animation) {
					mHeadBar.setVisibility(View.GONE);
					isRuning = true;
				}

				@Override
				public void onAnimationRepeat(Animation animation) {
				}

				@Override
				public void onAnimationEnd(Animation animation) {
					isRuning = false;
				}
			});
		}
	}

	/**
	 *
	 * @param HeadBar
	 */
	public void setHeadBar(ViewGroup HeadBar) {
		this.mHeadBar = HeadBar;
	}
}
